Aqueous secondary battery

a secondary battery and aqueous technology, applied in the field of aqueous secondary batteries, can solve the problems that the active materials that can function in non-aqueous electrolyte solutions do not necessarily function in aqueous electrolyte solutions, and achieve the effects of improving energy density, high output power, and high rate performan

Active Publication Date: 2011-04-14
TOYOTA CENT RES & DEV LAB INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]In view of the situations described above, it is a principal object of the present invention to provide an aqueous secondary battery containing an active material that can function in an aqueous electrolyte solution containing sodium. It is another object of the present invention to provide an aqueous secondary battery containing a positive-electrode active material that can function in an aqueous electrolyte solution containing sodium and that can improve energy density.
[0009]As a result of diligent research to achieve the objects described above, the present inventors completed the present invention by finding that a compound having a NASICON structure serving as an active material can insert and extract sodium in an aqueous electrolyte solution containing sodium and can improve energy density.
[0015]An aqueous secondary battery according to the present invention can operate with an aqueous electrolyte solution containing sodium. Use of a NASICON-type compound in the positive electrode can improve energy density. This aqueous secondary battery can employ sodium, which is a naturally abundant resource. The aqueous secondary battery can produce high output power and have high rate performance. This is probably because the aqueous secondary battery has the same advantages as aqueous lithium secondary batteries, and the interaction of sodium ions with water is smaller than the interaction of lithium ions with water.

Problems solved by technology

Furthermore, active materials that can function in non-aqueous electrolyte solutions do not necessarily function in aqueous electrolyte solutions.

Method used

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Examples

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example 1

[0036]An aqueous secondary battery was fabricated that included a positive electrode containing Na3V2(PO4)3 as a positive-electrode active material, a negative electrode containing NaTi2(PO4)3 as a negative-electrode active material, and an aqueous electrolyte solution containing NaNO3 as the electrolyte. 90% by weight of Na3V2(PO4)3 as the positive-electrode active material, 6% by weight of carbon black as the electroconductive material, and 4% by weight of a mixture of carboxymethylcellulose and styrene-butadiene rubber as the binder were sufficiently mixed. A proper amount of water was added to the mixture as a dispersant. The mixture was dispersed to produce a positive electrode mixture slurry. This positive electrode mixture was applied to both surfaces of aluminum foil having a thickness of 20 μl, was dried, and was densified with a roll press to produce a positive sheet electrode. 80% by weight of NaTi2(PO4)3 as the negative-electrode active material, 10% by weight of carbon ...

example 2

[0037]An aqueous secondary battery according to Example 2 was fabricated in the same way as in Example 1 except that the negative-electrode active material was LiTi2(PO4)3.

example 3

[0038]An aqueous secondary battery according to Example 3 was fabricated in the same way as in Example 1 except that the positive electrode contained LiFePO4 as the positive-electrode active material, and the negative electrode contained LiTi2(PO4)3 as the negative-electrode active material.

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Abstract

An aqueous secondary battery 10 according to the present invention includes a positive electrode containing a NASICON-type positive-electrode active material that can insert and extract sodium as a positive-electrode active material 12, a negative electrode containing a negative-electrode active material 17 that can insert and extract sodium, and an electrolyte solution 20 disposed between the positive electrode and the negative electrode, the electrolyte solution 20 being an aqueous solution in which sodium is dissolved. The NASICON-type positive-electrode active material is, for example, Na3V2(PO4)3, and the electrolyte solution 20 is an aqueous solution in which sodium is dissolved. The negative-electrode active material 17 is preferably a NASICON-type negative-electrode active material (for example, LiTi2(PO4)3 or NaTi2(PO4)3).

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an aqueous secondary battery and, more particularly, to an aqueous secondary battery in which sodium is dissolved.[0003]2. Description of the Related Art[0004]Aqueous lithium-ion secondary batteries that contain an aqueous solution as an electrolyte solution are conventionally known. In general, aqueous lithium-ion secondary batteries have the following advantages over the problems of non-aqueous lithium-ion secondary batteries. Since aqueous lithium-ion secondary batteries contain no organic solvent in the electrolyte solution, aqueous lithium-ion secondary batteries are basically non-flammable. Furthermore, since aqueous lithium-ion secondary batteries obviate the necessity for dry environments in a manufacturing process, manufacturing costs can be considerably reduced. In addition, since aqueous electrolyte solutions have higher electrical conductivity than non-aqueous electrolyte sol...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M10/0563
CPCH01M4/5825H01M2300/0002H01M10/36H01M4/661Y02E60/10
Inventor KONDO, HIROKI
Owner TOYOTA CENT RES & DEV LAB INC
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